app_main:=main.c  
app_main+=hello.o
app_hello:=hello.c


main: $(app_main)
	gcc -o main $^
	./main
	#rm -f main


hello.o: $(app_hello) hello.h
	gcc -c $(app_hello)  -o hello.o

.PHONY: clean
clean:
	-rm main
	rm hello.o 

	